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Add more nd_print_trunc() calls
[tcpdump] / print-dhcp6.c
1 /*
2 * Copyright (C) 1998 and 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /* \summary: IPv6 DHCP printer */
31
32 /*
33 * RFC3315: DHCPv6
34 * supported DHCPv6 options:
35 * RFC3319: Session Initiation Protocol (SIP) Servers options,
36 * RFC3633: IPv6 Prefix options,
37 * RFC3646: DNS Configuration options,
38 * RFC3898: Network Information Service (NIS) Configuration options,
39 * RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
40 * RFC4242: Information Refresh Time option,
41 * RFC4280: Broadcast and Multicast Control Servers options,
42 * RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
43 * RFC6334: Dual-Stack Lite option,
44 */
45
46 #ifdef HAVE_CONFIG_H
47 #include <config.h>
48 #endif
49
50 #include "netdissect-stdinc.h"
51
52 #include <stdio.h>
53 #include <string.h>
54
55 #include "netdissect.h"
56 #include "addrtoname.h"
57 #include "extract.h"
58
59 /* lease duration */
60 #define DHCP6_DURATION_INFINITE 0xffffffff
61
62 /* Error Values */
63 #define DH6ERR_FAILURE 16
64 #define DH6ERR_AUTHFAIL 17
65 #define DH6ERR_POORLYFORMED 18
66 #define DH6ERR_UNAVAIL 19
67 #define DH6ERR_OPTUNAVAIL 20
68
69 /* Message type */
70 #define DH6_SOLICIT 1
71 #define DH6_ADVERTISE 2
72 #define DH6_REQUEST 3
73 #define DH6_CONFIRM 4
74 #define DH6_RENEW 5
75 #define DH6_REBIND 6
76 #define DH6_REPLY 7
77 #define DH6_RELEASE 8
78 #define DH6_DECLINE 9
79 #define DH6_RECONFIGURE 10
80 #define DH6_INFORM_REQ 11
81 #define DH6_RELAY_FORW 12
82 #define DH6_RELAY_REPLY 13
83 #define DH6_LEASEQUERY 14
84 #define DH6_LQ_REPLY 15
85
86 static const struct tok dh6_msgtype_str[] = {
87 { DH6_SOLICIT, "solicit" },
88 { DH6_ADVERTISE, "advertise" },
89 { DH6_REQUEST, "request" },
90 { DH6_CONFIRM, "confirm" },
91 { DH6_RENEW, "renew" },
92 { DH6_REBIND, "rebind" },
93 { DH6_REPLY, "reply" },
94 { DH6_RELEASE, "release" },
95 { DH6_DECLINE, "decline" },
96 { DH6_RECONFIGURE, "reconfigure" },
97 { DH6_INFORM_REQ, "inf-req" },
98 { DH6_RELAY_FORW, "relay-fwd" },
99 { DH6_RELAY_REPLY, "relay-reply" },
100 { DH6_LEASEQUERY, "leasequery" },
101 { DH6_LQ_REPLY, "leasequery-reply" },
102 { 0, NULL }
103 };
104
105 /* DHCP6 base packet format */
106 struct dhcp6 {
107 union {
108 nd_uint8_t msgtype;
109 nd_uint32_t xid;
110 } dh6_msgtypexid;
111 /* options follow */
112 };
113 #define DH6_XIDMASK 0x00ffffff
114
115 /* DHCPv6 relay messages */
116 struct dhcp6_relay {
117 nd_uint8_t dh6relay_msgtype;
118 nd_uint8_t dh6relay_hcnt;
119 nd_ipv6 dh6relay_linkaddr; /* XXX: badly aligned */
120 nd_ipv6 dh6relay_peeraddr;
121 /* options follow */
122 };
123
124 /* options */
125 #define DH6OPT_CLIENTID 1
126 #define DH6OPT_SERVERID 2
127 #define DH6OPT_IA_NA 3
128 #define DH6OPT_IA_TA 4
129 #define DH6OPT_IA_ADDR 5
130 #define DH6OPT_ORO 6
131 #define DH6OPT_PREFERENCE 7
132 # define DH6OPT_PREF_MAX 255
133 #define DH6OPT_ELAPSED_TIME 8
134 #define DH6OPT_RELAY_MSG 9
135 /*#define DH6OPT_SERVER_MSG 10 deprecated */
136 #define DH6OPT_AUTH 11
137 # define DH6OPT_AUTHPROTO_DELAYED 2
138 # define DH6OPT_AUTHPROTO_RECONFIG 3
139 # define DH6OPT_AUTHALG_HMACMD5 1
140 # define DH6OPT_AUTHRDM_MONOCOUNTER 0
141 # define DH6OPT_AUTHRECONFIG_KEY 1
142 # define DH6OPT_AUTHRECONFIG_HMACMD5 2
143 #define DH6OPT_UNICAST 12
144 #define DH6OPT_STATUS_CODE 13
145 # define DH6OPT_STCODE_SUCCESS 0
146 # define DH6OPT_STCODE_UNSPECFAIL 1
147 # define DH6OPT_STCODE_NOADDRAVAIL 2
148 # define DH6OPT_STCODE_NOBINDING 3
149 # define DH6OPT_STCODE_NOTONLINK 4
150 # define DH6OPT_STCODE_USEMULTICAST 5
151 # define DH6OPT_STCODE_NOPREFIXAVAIL 6
152 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
153 # define DH6OPT_STCODE_MALFORMEDQUERY 8
154 # define DH6OPT_STCODE_NOTCONFIGURED 9
155 # define DH6OPT_STCODE_NOTALLOWED 10
156 #define DH6OPT_RAPID_COMMIT 14
157 #define DH6OPT_USER_CLASS 15
158 #define DH6OPT_VENDOR_CLASS 16
159 #define DH6OPT_VENDOR_OPTS 17
160 #define DH6OPT_INTERFACE_ID 18
161 #define DH6OPT_RECONF_MSG 19
162 #define DH6OPT_RECONF_ACCEPT 20
163 #define DH6OPT_SIP_SERVER_D 21
164 #define DH6OPT_SIP_SERVER_A 22
165 #define DH6OPT_DNS_SERVERS 23
166 #define DH6OPT_DOMAIN_LIST 24
167 #define DH6OPT_IA_PD 25
168 #define DH6OPT_IA_PD_PREFIX 26
169 #define DH6OPT_NIS_SERVERS 27
170 #define DH6OPT_NISP_SERVERS 28
171 #define DH6OPT_NIS_NAME 29
172 #define DH6OPT_NISP_NAME 30
173 #define DH6OPT_SNTP_SERVERS 31
174 #define DH6OPT_LIFETIME 32
175 #define DH6OPT_BCMCS_SERVER_D 33
176 #define DH6OPT_BCMCS_SERVER_A 34
177 #define DH6OPT_GEOCONF_CIVIC 36
178 #define DH6OPT_REMOTE_ID 37
179 #define DH6OPT_SUBSCRIBER_ID 38
180 #define DH6OPT_CLIENT_FQDN 39
181 #define DH6OPT_PANA_AGENT 40
182 #define DH6OPT_NEW_POSIX_TIMEZONE 41
183 #define DH6OPT_NEW_TZDB_TIMEZONE 42
184 #define DH6OPT_ERO 43
185 #define DH6OPT_LQ_QUERY 44
186 #define DH6OPT_CLIENT_DATA 45
187 #define DH6OPT_CLT_TIME 46
188 #define DH6OPT_LQ_RELAY_DATA 47
189 #define DH6OPT_LQ_CLIENT_LINK 48
190 #define DH6OPT_NTP_SERVER 56
191 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
192 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
193 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
194 #define DH6OPT_AFTR_NAME 64
195 #define DH6OPT_MUDURL 112
196
197 static const struct tok dh6opt_str[] = {
198 { DH6OPT_CLIENTID, "client-ID" },
199 { DH6OPT_SERVERID, "server-ID" },
200 { DH6OPT_IA_NA, "IA_NA" },
201 { DH6OPT_IA_TA, "IA_TA" },
202 { DH6OPT_IA_ADDR, "IA_ADDR" },
203 { DH6OPT_ORO, "option-request" },
204 { DH6OPT_PREFERENCE, "preference" },
205 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
206 { DH6OPT_RELAY_MSG, "relay-message" },
207 { DH6OPT_AUTH, "authentication" },
208 { DH6OPT_UNICAST, "server-unicast" },
209 { DH6OPT_STATUS_CODE, "status-code" },
210 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
211 { DH6OPT_USER_CLASS, "user-class" },
212 { DH6OPT_VENDOR_CLASS, "vendor-class" },
213 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
214 { DH6OPT_INTERFACE_ID, "interface-ID" },
215 { DH6OPT_RECONF_MSG, "reconfigure-message" },
216 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
217 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
218 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
219 { DH6OPT_DNS_SERVERS, "DNS-server" },
220 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
221 { DH6OPT_IA_PD, "IA_PD" },
222 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
223 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
224 { DH6OPT_LIFETIME, "lifetime" },
225 { DH6OPT_NIS_SERVERS, "NIS-server" },
226 { DH6OPT_NISP_SERVERS, "NIS+-server" },
227 { DH6OPT_NIS_NAME, "NIS-domain-name" },
228 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
229 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
230 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
231 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
232 { DH6OPT_REMOTE_ID, "Remote-ID" },
233 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
234 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
235 { DH6OPT_PANA_AGENT, "PANA-agent" },
236 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
237 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
238 { DH6OPT_ERO, "Echo-request-option" },
239 { DH6OPT_LQ_QUERY, "Lease-query" },
240 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
241 { DH6OPT_CLT_TIME, "Clt-time" },
242 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
243 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
244 { DH6OPT_NTP_SERVER, "NTP-server" },
245 { DH6OPT_AFTR_NAME, "AFTR-Name" },
246 { DH6OPT_MUDURL, "MUD-URL" },
247 { 0, NULL }
248 };
249
250 static const struct tok dh6opt_stcode_str[] = {
251 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
252 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
253 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
254 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
255 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
256 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
257 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
258 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
259 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
260 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
261 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
262 { 0, NULL }
263 };
264
265 struct dhcp6opt {
266 nd_uint16_t dh6opt_type;
267 nd_uint16_t dh6opt_len;
268 /* type-dependent data follows */
269 };
270
271 static const char *
272 dhcp6stcode(const uint16_t code)
273 {
274 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
275 }
276
277 static void
278 dhcp6opt_print(netdissect_options *ndo,
279 const u_char *cp, const u_char *ep)
280 {
281 const struct dhcp6opt *dh6o;
282 const u_char *tp;
283 u_int i;
284 uint16_t opttype;
285 uint16_t optlen;
286 uint8_t auth_proto;
287 uint8_t auth_alg;
288 uint8_t auth_rdm;
289 u_int authinfolen, authrealmlen;
290 u_int remain_len; /* Length of remaining options */
291 u_int label_len; /* Label length */
292 uint16_t subopt_code;
293 uint16_t subopt_len;
294 uint8_t dh6_reconf_type;
295 uint8_t dh6_lq_query_type;
296
297 if (cp == ep)
298 return;
299 while (cp < ep) {
300 if (ep < cp + sizeof(*dh6o))
301 goto trunc;
302 dh6o = (const struct dhcp6opt *)cp;
303 ND_TCHECK_SIZE(dh6o);
304 optlen = EXTRACT_BE_U_2(dh6o->dh6opt_len);
305 if (ep < cp + sizeof(*dh6o) + optlen)
306 goto trunc;
307 opttype = EXTRACT_BE_U_2(dh6o->dh6opt_type);
308 ND_PRINT(" (%s", tok2str(dh6opt_str, "opt_%u", opttype));
309 ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
310 switch (opttype) {
311 case DH6OPT_CLIENTID:
312 case DH6OPT_SERVERID:
313 if (optlen < 2) {
314 /*(*/
315 ND_PRINT(" ?)");
316 break;
317 }
318 tp = (const u_char *)(dh6o + 1);
319 switch (EXTRACT_BE_U_2(tp)) {
320 case 1:
321 if (optlen >= 2 + 6) {
322 ND_PRINT(" hwaddr/time type %u time %u ",
323 EXTRACT_BE_U_2(tp + 2),
324 EXTRACT_BE_U_4(tp + 4));
325 for (i = 8; i < optlen; i++)
326 ND_PRINT("%02x", EXTRACT_U_1(tp + i));
327 /*(*/
328 ND_PRINT(")");
329 } else {
330 /*(*/
331 ND_PRINT(" ?)");
332 }
333 break;
334 case 2:
335 if (optlen >= 2 + 8) {
336 ND_PRINT(" vid ");
337 for (i = 2; i < 2 + 8; i++)
338 ND_PRINT("%02x", EXTRACT_U_1(tp + i));
339 /*(*/
340 ND_PRINT(")");
341 } else {
342 /*(*/
343 ND_PRINT(" ?)");
344 }
345 break;
346 case 3:
347 if (optlen >= 2 + 2) {
348 ND_PRINT(" hwaddr type %u ",
349 EXTRACT_BE_U_2(tp + 2));
350 for (i = 4; i < optlen; i++)
351 ND_PRINT("%02x", EXTRACT_U_1(tp + i));
352 /*(*/
353 ND_PRINT(")");
354 } else {
355 /*(*/
356 ND_PRINT(" ?)");
357 }
358 break;
359 default:
360 ND_PRINT(" type %u)", EXTRACT_BE_U_2(tp));
361 break;
362 }
363 break;
364 case DH6OPT_IA_ADDR:
365 if (optlen < 24) {
366 /*(*/
367 ND_PRINT(" ?)");
368 break;
369 }
370 tp = (const u_char *)(dh6o + 1);
371 ND_PRINT(" %s", ip6addr_string(ndo, tp));
372 ND_PRINT(" pltime:%u vltime:%u",
373 EXTRACT_BE_U_4(tp + 16),
374 EXTRACT_BE_U_4(tp + 20));
375 if (optlen > 24) {
376 /* there are sub-options */
377 dhcp6opt_print(ndo, tp + 24, tp + optlen);
378 }
379 ND_PRINT(")");
380 break;
381 case DH6OPT_ORO:
382 case DH6OPT_ERO:
383 if (optlen % 2) {
384 ND_PRINT(" ?)");
385 break;
386 }
387 tp = (const u_char *)(dh6o + 1);
388 for (i = 0; i < optlen; i += 2) {
389 ND_PRINT(" %s",
390 tok2str(dh6opt_str, "opt_%u", EXTRACT_BE_U_2(tp + i)));
391 }
392 ND_PRINT(")");
393 break;
394 case DH6OPT_PREFERENCE:
395 if (optlen != 1) {
396 ND_PRINT(" ?)");
397 break;
398 }
399 tp = (const u_char *)(dh6o + 1);
400 ND_PRINT(" %u)", EXTRACT_U_1(tp));
401 break;
402 case DH6OPT_ELAPSED_TIME:
403 if (optlen != 2) {
404 ND_PRINT(" ?)");
405 break;
406 }
407 tp = (const u_char *)(dh6o + 1);
408 ND_PRINT(" %u)", EXTRACT_BE_U_2(tp));
409 break;
410 case DH6OPT_RELAY_MSG:
411 ND_PRINT(" (");
412 tp = (const u_char *)(dh6o + 1);
413 dhcp6_print(ndo, tp, optlen);
414 ND_PRINT(")");
415 break;
416 case DH6OPT_AUTH:
417 if (optlen < 11) {
418 ND_PRINT(" ?)");
419 break;
420 }
421 tp = (const u_char *)(dh6o + 1);
422 auth_proto = EXTRACT_U_1(tp);
423 switch (auth_proto) {
424 case DH6OPT_AUTHPROTO_DELAYED:
425 ND_PRINT(" proto: delayed");
426 break;
427 case DH6OPT_AUTHPROTO_RECONFIG:
428 ND_PRINT(" proto: reconfigure");
429 break;
430 default:
431 ND_PRINT(" proto: %u", auth_proto);
432 break;
433 }
434 tp++;
435 auth_alg = EXTRACT_U_1(tp);
436 switch (auth_alg) {
437 case DH6OPT_AUTHALG_HMACMD5:
438 /* XXX: may depend on the protocol */
439 ND_PRINT(", alg: HMAC-MD5");
440 break;
441 default:
442 ND_PRINT(", alg: %u", auth_alg);
443 break;
444 }
445 tp++;
446 auth_rdm = EXTRACT_U_1(tp);
447 switch (auth_rdm) {
448 case DH6OPT_AUTHRDM_MONOCOUNTER:
449 ND_PRINT(", RDM: mono");
450 break;
451 default:
452 ND_PRINT(", RDM: %u", auth_rdm);
453 break;
454 }
455 tp++;
456 ND_PRINT(", RD:");
457 for (i = 0; i < 4; i++, tp += 2)
458 ND_PRINT(" %04x", EXTRACT_BE_U_2(tp));
459
460 /* protocol dependent part */
461 authinfolen = optlen - 11;
462 switch (auth_proto) {
463 case DH6OPT_AUTHPROTO_DELAYED:
464 if (authinfolen == 0)
465 break;
466 if (authinfolen < 20) {
467 ND_PRINT(" ??");
468 break;
469 }
470 authrealmlen = authinfolen - 20;
471 if (authrealmlen > 0) {
472 ND_PRINT(", realm: ");
473 }
474 for (i = 0; i < authrealmlen; i++, tp++)
475 ND_PRINT("%02x", EXTRACT_U_1(tp));
476 ND_PRINT(", key ID: %08x", EXTRACT_BE_U_4(tp));
477 tp += 4;
478 ND_PRINT(", HMAC-MD5:");
479 for (i = 0; i < 4; i++, tp+= 4)
480 ND_PRINT(" %08x", EXTRACT_BE_U_4(tp));
481 break;
482 case DH6OPT_AUTHPROTO_RECONFIG:
483 if (authinfolen != 17) {
484 ND_PRINT(" ??");
485 break;
486 }
487 switch (EXTRACT_U_1(tp)) {
488 case DH6OPT_AUTHRECONFIG_KEY:
489 ND_PRINT(" reconfig-key");
490 break;
491 case DH6OPT_AUTHRECONFIG_HMACMD5:
492 ND_PRINT(" type: HMAC-MD5");
493 break;
494 default:
495 ND_PRINT(" type: ??");
496 break;
497 }
498 tp++;
499 ND_PRINT(" value:");
500 for (i = 0; i < 4; i++, tp+= 4)
501 ND_PRINT(" %08x", EXTRACT_BE_U_4(tp));
502 break;
503 default:
504 ND_PRINT(" ??");
505 break;
506 }
507
508 ND_PRINT(")");
509 break;
510 case DH6OPT_RAPID_COMMIT: /* nothing todo */
511 ND_PRINT(")");
512 break;
513 case DH6OPT_INTERFACE_ID:
514 case DH6OPT_SUBSCRIBER_ID:
515 /*
516 * Since we cannot predict the encoding, print hex dump
517 * at most 10 characters.
518 */
519 tp = (const u_char *)(dh6o + 1);
520 ND_PRINT(" ");
521 for (i = 0; i < optlen && i < 10; i++)
522 ND_PRINT("%02x", EXTRACT_U_1(tp + i));
523 ND_PRINT("...)");
524 break;
525 case DH6OPT_RECONF_MSG:
526 if (optlen != 1) {
527 ND_PRINT(" ?)");
528 break;
529 }
530 tp = (const u_char *)(dh6o + 1);
531 dh6_reconf_type = EXTRACT_U_1(tp);
532 switch (dh6_reconf_type) {
533 case DH6_RENEW:
534 ND_PRINT(" for renew)");
535 break;
536 case DH6_INFORM_REQ:
537 ND_PRINT(" for inf-req)");
538 break;
539 default:
540 ND_PRINT(" for ?\?\?(%02x))", dh6_reconf_type);
541 break;
542 }
543 break;
544 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
545 ND_PRINT(")");
546 break;
547 case DH6OPT_SIP_SERVER_A:
548 case DH6OPT_DNS_SERVERS:
549 case DH6OPT_SNTP_SERVERS:
550 case DH6OPT_NIS_SERVERS:
551 case DH6OPT_NISP_SERVERS:
552 case DH6OPT_BCMCS_SERVER_A:
553 case DH6OPT_PANA_AGENT:
554 case DH6OPT_LQ_CLIENT_LINK:
555 if (optlen % 16) {
556 ND_PRINT(" ?)");
557 break;
558 }
559 tp = (const u_char *)(dh6o + 1);
560 for (i = 0; i < optlen; i += 16)
561 ND_PRINT(" %s", ip6addr_string(ndo, tp + i));
562 ND_PRINT(")");
563 break;
564 case DH6OPT_SIP_SERVER_D:
565 case DH6OPT_DOMAIN_LIST:
566 tp = (const u_char *)(dh6o + 1);
567 while (tp < cp + sizeof(*dh6o) + optlen) {
568 ND_PRINT(" ");
569 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
570 goto trunc;
571 }
572 ND_PRINT(")");
573 break;
574 case DH6OPT_STATUS_CODE:
575 if (optlen < 2) {
576 ND_PRINT(" ?)");
577 break;
578 }
579 tp = (const u_char *)(dh6o + 1);
580 ND_PRINT(" %s)", dhcp6stcode(EXTRACT_BE_U_2(tp)));
581 break;
582 case DH6OPT_IA_NA:
583 case DH6OPT_IA_PD:
584 if (optlen < 12) {
585 ND_PRINT(" ?)");
586 break;
587 }
588 tp = (const u_char *)(dh6o + 1);
589 ND_PRINT(" IAID:%u T1:%u T2:%u",
590 EXTRACT_BE_U_4(tp),
591 EXTRACT_BE_U_4(tp + 4),
592 EXTRACT_BE_U_4(tp + 8));
593 if (optlen > 12) {
594 /* there are sub-options */
595 dhcp6opt_print(ndo, tp + 12, tp + optlen);
596 }
597 ND_PRINT(")");
598 break;
599 case DH6OPT_IA_TA:
600 if (optlen < 4) {
601 ND_PRINT(" ?)");
602 break;
603 }
604 tp = (const u_char *)(dh6o + 1);
605 ND_PRINT(" IAID:%u", EXTRACT_BE_U_4(tp));
606 if (optlen > 4) {
607 /* there are sub-options */
608 dhcp6opt_print(ndo, tp + 4, tp + optlen);
609 }
610 ND_PRINT(")");
611 break;
612 case DH6OPT_IA_PD_PREFIX:
613 if (optlen < 25) {
614 ND_PRINT(" ?)");
615 break;
616 }
617 tp = (const u_char *)(dh6o + 1);
618 ND_PRINT(" %s/%u", ip6addr_string(ndo, tp + 9), EXTRACT_U_1(tp + 8));
619 ND_PRINT(" pltime:%u vltime:%u",
620 EXTRACT_BE_U_4(tp),
621 EXTRACT_BE_U_4(tp + 4));
622 if (optlen > 25) {
623 /* there are sub-options */
624 dhcp6opt_print(ndo, tp + 25, tp + optlen);
625 }
626 ND_PRINT(")");
627 break;
628 case DH6OPT_LIFETIME:
629 case DH6OPT_CLT_TIME:
630 if (optlen != 4) {
631 ND_PRINT(" ?)");
632 break;
633 }
634 tp = (const u_char *)(dh6o + 1);
635 ND_PRINT(" %u)", EXTRACT_BE_U_4(tp));
636 break;
637 case DH6OPT_REMOTE_ID:
638 if (optlen < 4) {
639 ND_PRINT(" ?)");
640 break;
641 }
642 tp = (const u_char *)(dh6o + 1);
643 ND_PRINT(" %u ", EXTRACT_BE_U_4(tp));
644 /*
645 * Print hex dump first 10 characters.
646 */
647 for (i = 4; i < optlen && i < 14; i++)
648 ND_PRINT("%02x", EXTRACT_U_1(tp + i));
649 ND_PRINT("...)");
650 break;
651 case DH6OPT_LQ_QUERY:
652 if (optlen < 17) {
653 ND_PRINT(" ?)");
654 break;
655 }
656 tp = (const u_char *)(dh6o + 1);
657 dh6_lq_query_type = EXTRACT_U_1(tp);
658 switch (dh6_lq_query_type) {
659 case 1:
660 ND_PRINT(" by-address");
661 break;
662 case 2:
663 ND_PRINT(" by-clientID");
664 break;
665 default:
666 ND_PRINT(" type_%u", dh6_lq_query_type);
667 break;
668 }
669 ND_PRINT(" %s", ip6addr_string(ndo, tp + 1));
670 if (optlen > 17) {
671 /* there are query-options */
672 dhcp6opt_print(ndo, tp + 17, tp + optlen);
673 }
674 ND_PRINT(")");
675 break;
676 case DH6OPT_CLIENT_DATA:
677 tp = (const u_char *)(dh6o + 1);
678 if (optlen > 0) {
679 /* there are encapsulated options */
680 dhcp6opt_print(ndo, tp, tp + optlen);
681 }
682 ND_PRINT(")");
683 break;
684 case DH6OPT_LQ_RELAY_DATA:
685 if (optlen < 16) {
686 ND_PRINT(" ?)");
687 break;
688 }
689 tp = (const u_char *)(dh6o + 1);
690 ND_PRINT(" %s ", ip6addr_string(ndo, tp));
691 /*
692 * Print hex dump first 10 characters.
693 */
694 for (i = 16; i < optlen && i < 26; i++)
695 ND_PRINT("%02x", EXTRACT_U_1(tp + i));
696 ND_PRINT("...)");
697 break;
698 case DH6OPT_NTP_SERVER:
699 if (optlen < 4) {
700 ND_PRINT(" ?)");
701 break;
702 }
703 tp = (const u_char *)(dh6o + 1);
704 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
705 subopt_code = EXTRACT_BE_U_2(tp);
706 tp += 2;
707 subopt_len = EXTRACT_BE_U_2(tp);
708 tp += 2;
709 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
710 goto trunc;
711 ND_PRINT(" subopt:%u", subopt_code);
712 switch (subopt_code) {
713 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
714 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
715 if (subopt_len != 16) {
716 ND_PRINT(" ?");
717 break;
718 }
719 ND_PRINT(" %s", ip6addr_string(ndo, tp));
720 break;
721 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
722 ND_PRINT(" ");
723 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
724 goto trunc;
725 break;
726 default:
727 ND_PRINT(" ?");
728 break;
729 }
730 tp += subopt_len;
731 }
732 ND_PRINT(")");
733 break;
734 case DH6OPT_AFTR_NAME:
735 if (optlen < 3) {
736 ND_PRINT(" ?)");
737 break;
738 }
739 tp = (const u_char *)(dh6o + 1);
740 remain_len = optlen;
741 ND_PRINT(" ");
742 /* Encoding is described in section 3.1 of RFC 1035 */
743 while (remain_len && EXTRACT_U_1(tp)) {
744 label_len = EXTRACT_U_1(tp);
745 tp++;
746 if (label_len < remain_len - 1) {
747 (void)nd_printn(ndo, tp, label_len, NULL);
748 tp += label_len;
749 remain_len -= (label_len + 1);
750 if(EXTRACT_U_1(tp)) ND_PRINT(".");
751 } else {
752 ND_PRINT(" ?");
753 break;
754 }
755 }
756 ND_PRINT(")");
757 break;
758 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
759 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
760 case DH6OPT_MUDURL: /* although GMT might not work */
761 if (optlen < 5) {
762 ND_PRINT(" ?)");
763 break;
764 }
765 tp = (const u_char *)(dh6o + 1);
766 ND_PRINT("=");
767 (void)nd_printn(ndo, tp, (u_int)optlen, NULL);
768 ND_PRINT(")");
769 break;
770
771 default:
772 ND_PRINT(")");
773 break;
774 }
775
776 cp += sizeof(*dh6o) + optlen;
777 }
778 return;
779
780 trunc:
781 nd_print_trunc(ndo);
782 }
783
784 /*
785 * Print dhcp6 packets
786 */
787 void
788 dhcp6_print(netdissect_options *ndo,
789 const u_char *cp, u_int length)
790 {
791 const struct dhcp6 *dh6;
792 const struct dhcp6_relay *dh6relay;
793 uint8_t msgtype;
794 const u_char *ep;
795 const u_char *extp;
796 const char *name;
797
798 ndo->ndo_protocol = "dhcp6";
799 ND_PRINT("dhcp6");
800
801 ep = ndo->ndo_snapend;
802 if (cp + length < ep)
803 ep = cp + length;
804
805 dh6 = (const struct dhcp6 *)cp;
806 dh6relay = (const struct dhcp6_relay *)cp;
807 ND_TCHECK_4(dh6->dh6_msgtypexid.xid);
808 msgtype = EXTRACT_U_1(dh6->dh6_msgtypexid.msgtype);
809 name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
810
811 if (!ndo->ndo_vflag) {
812 ND_PRINT(" %s", name);
813 return;
814 }
815
816 /* XXX relay agent messages have to be handled differently */
817
818 ND_PRINT(" %s (", name); /*)*/
819 if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
820 ND_PRINT("xid=%x",
821 EXTRACT_BE_U_4(dh6->dh6_msgtypexid.xid) & DH6_XIDMASK);
822 extp = (const u_char *)(dh6 + 1);
823 dhcp6opt_print(ndo, extp, ep);
824 } else { /* relay messages */
825 ND_TCHECK_16(dh6relay->dh6relay_peeraddr);
826
827 ND_PRINT("linkaddr=%s", ip6addr_string(ndo, dh6relay->dh6relay_linkaddr));
828
829 ND_PRINT(" peeraddr=%s", ip6addr_string(ndo, dh6relay->dh6relay_peeraddr));
830
831 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
832 }
833 /*(*/
834 ND_PRINT(")");
835 return;
836
837 trunc:
838 nd_print_trunc(ndo);
839 }
[mirror] the TCPdump network dissector